Net growth rates of picocyanobacteria and nano-/microphytoplankton inhabiting shelf waters of the central (17°S) and southern (20°S) Great Barrier Reef

被引:22
作者
Crosbie, ND
Furnas, MJ
机构
[1] Australian Inst Marine Sci, Townsville, Qld 4810, Australia
[2] James Cook Univ N Queensland, Cooperat Res Ctr Ecologically Sustainable Dev Gre, Townsville, Qld 4811, Australia
关键词
Synechococcus; Prochlorococcus; tropical nano-/microphytoplankton; growth rates;
D O I
10.3354/ame024209
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Growth rates of diffusion cultures of nano- and microphytoplankton from Great Barrier Reef shelf water, especially diatoms (mu (max) = 3.2 doublings d(-1)), exceeded those of picocyanobacteria (Prochlorococcus and Synechococcus) when DIN (NH4+ + No-2(-) + NO3-) concentrations were greater than or equal to0.05 muM. The picocyanobacteria (mu (max) = 1.1 and 1.6 doublings d(-1) for Prochlorococcus and Synechococcus respectively) achieved higher relative and absolute growth rates when time-averaged DIN concentrations were <0.05 muM. Most estimates (71 %) of in situ growth rates of nano-/microphytoplankton were less than or equal to 0.25 of mu (max) when DIN concentrations were <0.1 muM, while only 18 % of in situ picocyanobacteria growth rates were less than or equal to0.25 of mu (max) when DIN concentrations were <0.1 muM, the majority being greater than or equal to0.50 of mu (max) at such DIN concentrations. Thus growth rates of Synechococcus and Prochlorococcus populations did not appear to be significantly nutrient (nitrogen)-limited under ambient concentrations, and were of similar order to those measured in the equatorial Pacific Ocean, where NO3- concentrations (>2 muM) are far above growth-saturating levels, and in the oligotrophic North Pacific Gyre. In contrast, for those nano-/microphytoplankton for which in situ or simulated in situ growth rates were estimated, growth rates appeared to be nitrogen-limited at DIN concentrations <0.1 muM. The results provide further support for the hypothesis that picocyanobacteria dominate oligotrophic marine water columns because of their superior ability to grow at low nutrient concentrations.
引用
收藏
页码:209 / 224
页数:16
相关论文
共 83 条
[1]   Nutrient and temperature control of the contribution of picoplankton to phytoplankton biomass and production [J].
Agawin, NSR ;
Duarte, CM ;
Agustí, S .
LIMNOLOGY AND OCEANOGRAPHY, 2000, 45 (03) :591-600
[2]   CHARACTERISTICS, DYNAMICS AND SIGNIFICANCE OF MARINE SNOW [J].
ALLDREDGE, AL ;
SILVER, MW .
PROGRESS IN OCEANOGRAPHY, 1988, 20 (01) :41-82
[3]  
[Anonymous], DOWNSTREAM EFFECTS L
[4]  
[Anonymous], 1997, Identifying marine phytoplankton
[5]  
[Anonymous], 1973, HDB PHYCOLOGICAL MET
[6]   THE ROLE OF DISSOLVED ORGANIC NITROGEN IN PHYTOPLANKTON NUTRITION, CELL BIOLOGY AND ECOLOGY [J].
ANTIA, NJ ;
HARRISON, PJ ;
OLIVEIRA, L .
PHYCOLOGIA, 1991, 30 (01) :1-89
[7]   RETENTION OF PHYTOPLANKTON AND PLANKTONIC MICROBES ON CORAL-REEFS WITHIN THE GREAT-BARRIER-REEF, AUSTRALIA [J].
AYUKAI, T .
CORAL REEFS, 1995, 14 (03) :141-147
[8]   PICOPLANKTON DYNAMICS IN DAVIES REEF LAGOON, THE GREAT-BARRIER-REEF, AUSTRALIA [J].
AYUKAI, T .
JOURNAL OF PLANKTON RESEARCH, 1992, 14 (11) :1593-1606
[9]  
BANSE K, 1992, ENVIR SCI R, V43, P409
[10]  
Banse K., 1994, Oceanography, V7, P13, DOI [10.5670/oceanog.1994.10, DOI 10.5670/OCEANOG.1994.10]